Telephone-repeater.



- U. ADAMS-RANDALL.

TELEPHONE REPEATER. APPLICATION FILED 1 3.15, 1905.

9'?0,28,, Patented Sept. 13,1910.

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O. ADAMS-RANDALL.

TELEPHONE REPEATER. APPLICATION FILED APR.15,1905.

970,288, Patented Sept. 13, 1910. l

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, UNITED TA ;1 X; NT-

CHARLES ADAMS-RANDALL, OF NEW YORK, N. Y.

TELEPHONE-REPEAT-ER.

To all whom "It may concern: Be it known that I, CHARLES ADAMS-RAN- 'DALL, a citizen of the United States, resid- This invention relates to what is techni-v cally known as telephone repeaters telephone relays.

The invention has for its object the autoand I matic repetition of telephonic messages from one main line circuit into, another mam line circuit.

In the application for use of the invention or over or upon,

. as a telephone relay, that is, for reproorganization. from a repeater to a relay it is only ducing the messages transmitted from a main line circuit, in a local circuit, increased loudness of the messages results by the use of a local battery in the local circuits similar to the usual telegraph relay and sounder To change the apparatus necessary to convert the second main line circuit connectionsto a. local circuit.

The invention consists, generally, in the use of an electromagnetic telephone transthe controller mitter in combination with an electro-magnetic line controlling devicewhich is termed The controller is so constructed that when the rapid, alternating telephone current-s or impulses are passing thereover, the electro-magnetic element of the controller is energized and the arn'lature thereof is attracted and held in one position.

'magnet or the microphone or both being preferably adjustable to and from each other. The microphone, or that part ,of the transmitter which constitutes the variable contact, may be of anyof the well known forms, but preferably I employ the form of transmitter disclosed in my Paten No. 554,141, dated February 4, 1896. A simple,

' s iiigl ontact'form ofitra nsmitter, however,

is shown herewith to demonstrate the practicability of the apparatus.

Specification of Letters Patent. Patented Sept. 13, 1910.

Application filed April 15, 1905. Serial No. 255,754.

A further important feature of the invention is the plan or organization of circuit connections, provided with'means for automatically connecting the same. The several features of the invention will, however, be more fully hereinafter set forth in detail in the subsequent description.

In the drawings, Figure 1 is a diagrammatic view of one form of'the apparatus and circuits. Fig. 2 is a plan view of the armature of the controller. Fig. 3 is a .view sim lar to Fig. 1, showing a modified form, of the apparatus. and the circuit connections therefor. I

Similar characters of reference are employed to indicate corresponding parts in the several views.

The numerals 1, 1, Fig.' 1, designate the electro-magnetic transmitters, 2, 2 the controllers, and C an induction coil having its primary 3 included in the local circuit with a battery B and a microphone 4. The secondary coil 5 of the induction coil is included in the main line circuit E. when required. The 'imluction coil (Mi or-anal adjacent to the electro-magnetic transmitter 1' and controller 2, at- :i distance from the likc' mechanisms, which may be at another sta- 'tion, has its primary coil (5 included in a local circuit with a battery 13 and micro- "included in their respective main line cir' cuits. As shown, the said extended pole ends are magnetized by the use of a current from a battery B B passing over the coils 11, 11. It will be-readily understood that in lieu of the battery and coils just set forth, a permanent magnet may be used, care being taken to obtain a normally strong magnetic field at the pole ends. The magnetic transmitters, as shown, have centrally secured to the diaphragms D and D thereof, andon one side, magnetic extension pieces 12, 12 which act as armatures, and cause the diaphragmsto vibrate in unison with the variations caused in the magnetic field by the currents passing over the main line coils 10 and 10'. To the opposite sides of the diaphragms, contact pieces 13 and 13" are secured and composed preferably of-arbon,

'hereinbefore noted.

It is to be understood that the invention is not limited to the exact apparatus shown, which is simply representative, and various forms of electro-magnetic transmitters may be devised, having in view strong magnetic effects. The controllers may also be modified in many Ways without departing from the spirit of the invention, the main feature being'to have an electro-magnetic device readily responsive to the action ofthe telephone currents or impulses, and so constructed, by using long coils or otherwise, that the same will be slow to discharge in contradistinction to a telegraph relay, in which rapid charge and discharge of the magnet is sought and essential, due consideration being given to the power or energy of such apparatus.

The apparatus heretofore disclosed is actuated and controlledby the act of speaking into the transmitter at either sending station, and without pursuing such act the apparatus would have no practical operation, and hence the invention is thereby materially distinguished from mechanically controlled signal or sign apparatuses.

Having thus fully described the invention, what is claimed as new is:

1. A telephone repeating apparatus of the class specified, embodying two independent normally closed main line circuits, each circuit being characterized by an electro-magn'etic line controlling device for rendering the circuits operative, one by the other, and an electric transmitter.

2. A telephone repeating apparatus embodying two independent normally closed main line circuits individually having an electro-magnetic line controlling device for rendering the circuits operative, one by the other, an electric transmitter, and circuit connectors.

3. A telephone repeating apparatus em- .loodying normally closed independent main line circuits each having means for opening and closing the other, and electric transmitting means.

4. In a telephone system of the class specified, the combination with a telephone circuit, of means for generating and transmit ting voice-caused currents thereover, a sec- 0nd telephone circuit independent of the first circuit, the said circuits being normally closed, and independent means in each circuit actuated by said voice-caused currents for controlling the circuits.

lg A telephone apparatusof the cla'ss'described having two independent main line circuits, intermediate means for reproducing telephonic speech, sounds or the like, alternately from one main line circuit into the other main line circuit, consisting of electromagnetic telephonic translnitting means, induction coils, batteries and circuit connections, and an electro-magnetic device in each 'main line circuit actuated and controlled by the act of speaking into the transmitter at 'either sending station whereby from the dis tant terminal of either of the two independent main line circuits the other circuit can be automatically selected and connected in or electrically completed at the said intermediate means. i

- 6. In a telephone apparatus of the class described, two independent main line circuits, means for generating and transmitting voicecaused currents over said circuits, and means in each circuit actuated by said voicecaiised currents toautomatically select and connect in the other or second circuit to enable the operator of either of the mainline circuits to control the two independent main line circuits by the act of speaking into the transmitter of either of the said circuits.

7. A telephone repeater characterized by two independent normally closed main line circuits each' having an electro-magnetic controlling device, an el'ectro-magnetic transmitting apparatus, induction coils, local batteries and circuit connectors, each electromagnetic line controlling device being auto ,matically actuated by the act 0% speaking into the transmitting apparatus at either sending station, and the operator at either sending station being enabled to gain control of the complete apparatus by speaking into the transmitting apparatus at the terminal of either station.

8. A telephone repeating apparatus characterized by independent normally closed main line circuits each havingan electromagnetic controlling device, electro-magnetic' telephone transmitters having their coils connected to the independent main line circuits and provided with a variable contact, batteries, and induction'coils, the variable contacts being connected up in one set of circuits with the batteries and primary coils of the induction coils, the secondary coils of the induction coils being also connected up to the main line circuits and'the coils ofthe electro-magnetic controlling devices being included in the main line circuits and serving to automatically connect the secondary coils of the induction coils to the respective circuits for the purpose of repeatlng and reproducing in one mam line 'thereover, and independent means in each circuit actuated by said voice-caused currents for connecting the circuits and including movable elements which are attracted and held in one position when said independent means are energized by rapidalternating telephone currents or impulses passing over the circuit of which each independent means is-a part for selecting and completing the other-main line circuit. 1 I

1.0. Ina telephone apparatus of the class described, independent normally closed main line circuits, means for generating and transmittin voice-caused currents over said clrcults, an independent means 1n each circuit automatically operated by said'voicecaused currents for connecting the two circuits and including movable elements which are'held in closed position when'saidineans are energized.

, 11.; In a telephone apparatus of the class described, independent main line circuits, means for generating and transmitting voice-caused currents over said circuits, and

means in each circuit actuated by the voicecaused current-s over the circuit of which each of said means is a part for interchangeably selecting and completing automatically either of the two main line circuits for the reception of the repeated or retransmitted messages at the W111 of an operator speaking from either of the main line circuits.

12. Ina telephone apparatus ofthe class -described,'two' independent normally closed main line circuits over either of .WhlOl'l telephonic messages may be sent, andelectrosai producing upon one of said circuits electrical lmpulses corresponding to the voicemagnetic means for individuallycontrollingv clrcuits, and electro-magnetlc means for caused currents passing over or upon the other circuit.

13. In a telephone system the combination with a-telephonecircuit, of means for currents over said circuit, a second telephone circu t, said circuits being normally closed generating and transmitting voice-caused" and means individually cooperating with eachcircuit and actuated by said voicecaused currents for connecting either of the circuits. I

' 14. A telephone apparatus of the class described having means for reproducing telephonic speech, sounds or the like alternately from one main line circuit into another main line circuit, the two main line circuits beingindependent and normally closed, said means consisting of an electromagnetic telephone transmitter, induction coils, batteries and circuit connections, and electro-magnetic ap-' paratus individually included in each main line circuit for automaticall selecting and connecting in or electrica lycompleting either of the two. independent main line cir cuits, said electro-magnetic apparatus'being complete foreach circuit andoperated by' voice-caused currents passing thereover and over the circuit of which it 1s a part.

In testihiony whereof I-have hereunto set my hand in presence of two subscribing witesses.

' CHARLES ADAMS-RANDALL. I Witnesses: q J. CoUR'rRoME, 4 M. B. LovELAoE. 

